Soak rolls in cold water. Peel and finely chop the onion. Cut pepperoni into rings. Squeeze the bread roll well. Knead minced meat, roll, onion, pepperoni and egg well. Season with salt, pepper and cumin.
Cut the feta cheese into 8 cubes. Form 8 meatballs from the minced dough, pressing 1 sheep's cheese cube in the middle of each. Heat the oil in a pan and fry the meatballs for about 10 minutes.
In the meantime, clean the salad and cut into strips. Wash and quarter the cucumber and cut it into pieces. Wash the tomato. Peel and quarter onion. Cut both into slices. Mix vinegar, salt and pepper.
Add oil. Mix the marinade with the salad ingredients and arrange on a plate. Place the meatballs on top and garnish with parsley and pepperoni.